[dpdk-dev] Scenario of dpdk-iokit //Re: Fwd: dpdk-iokit: Turn dpdk into the IO field.

[Vincent JARDIN]

so on the list if you prefer to do so ;) did you try a "perf top" on 
your system under load?


On 19/11/2013 10:56, March Jane wrote:
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>   	Gratitude to reply.
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> 	FCP and Full-offload iSCSI will be nice, for example Qlogic 16Gbps FCP.
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> 	But IO scenario is very different from IP scenario as my understanding.
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> 	March	
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> 	BTW: Do you have people at Bay Area?
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> 	PS:
> 		Already finished header file for dpdk-iokit/libiokit_sctgt
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> On Nov 19, 2013, at 5:45 PM, Vincent JARDIN <vincent.jardin at 6wind.com> wrote:
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>> (off list since it coul become a troll ;) )
>>
>> At 6WIND, we developed a librte_crypto as a generic framework to manage any crypto framework:
>>   - Intel's QuickAssist
>>   - Cavium' Nitrox II
>>   - AES/NI SW crypto
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>> it was required in order to manage high rate of PCI IOs for Cryptos (IPsec, SSL, etc...)
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>> So, after the librte_pmd_mlx4, Virtio, Vmxnet3, that's more than 6 ultra low latency/very efficient drivers that we added into the DPDK and promoted.
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>> Which storage drivers would you foresee first to be run in userland?
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>> Best regards,
>>
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>> On 19/11/2013 02:22, March Jane wrote:
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>>>   — Nowadays dilemmas in enterprise-class storage system & motivation --
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>>>       	The model of most storage system is ‘Front-end cards + CPU + back-end magnetic media hard drive’, in such system, the hard drive is very slow in terms of its capability in random accessing - roughly 200IO per second, in contrast, the processor is very fast, therefore many software stack can tolerate waste of CPU cycle for exploiting capabilities of hard drive.
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>>> 	In addition, regularly software for SAN is developed under kernel space in order to achieve low latency - few milliseconds per request, and IO pressure in scenario of heavy workload. Usually software in user-space with POSIX is slow. However kernel-space developing is nightmare for engineers, even we have approaches to simulate these code under user-space.
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>>>      However, so far flash is coming to popular, the gap between CPU and media is overturned, a single flash card can be easy to reach 1M iops, if plug 10 such cards inside a server, the processor is hard to back. Thus, today’s challenge in flash storage is to exploit the capability of processor, ironically.  In addition to this purpose, move to user-space is also a motivation, if move to user-space is OS-bypass rather than moving to POSIX.
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>>>   	Best
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>>> 	- March
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